To-be-detected liquid sample manufacturing mechanism applied to pesticide residue detection

Abstract

The invention relates to the technical field of pesticide residue detection, in particular to a to-be-detected liquid sample manufacturing mechanism applied to pesticide residue detection, the to-be-detected liquid sample manufacturing mechanism comprises a main control device, a liquid sample storing and taking device and a conveying device, the main control device is used for coordinating and controlling all the devices to work cooperatively, and automatic manufacturing of a to-be-detected liquid sample for pesticide residue detection is achieved. Compared with a traditional pesticide residue detection scheme, the to-be-detected liquid sample manufacturing mechanism applied to pesticide residue detection has the advantages that functional steps of liquid sample manufacturing, liquid sample transferring, reagent or enzyme adding, to-be-detected liquid uniform mixing, substrate adding and the like are automatically achieved through mutual cooperation of the liquid sample storing and taking device and the conveying device, and the to-be-detected liquid sample manufacturing mechanism applied to pesticide residue detection has the advantages that the structural design is reasonable; all the device parts can cooperate with one another, and the occupied area is reduced; 2, in the pesticide residue detection process, the to-be-detected liquid sample is manufactured without depending on professional operation of professionals, so that the pesticide residue detection efficiency is improved, the labor cost is reduced, and the pesticide residue detection cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pesticide residue detection, in particular to a test liquid sample preparation mechanism used for pesticide residue detection. Background Art

[0002] Pesticides are widely used in preventing and controlling crop diseases and insect pests due to their high efficiency, rapidity, economy, and convenience. However, they can also cause pesticide residues on agricultural products, posing a threat to food safety. Therefore, pesticide residue detection equipment is needed to detect pesticide residues in agricultural products. At present, most conventional laboratory testing equipment is used for pesticide residue detection. Such conventional testing equipment cannot automatically add buffers, enzymes, reagents, substrates, etc., and professional technicians are required to manually test agricultural products. They have a low degree of intelligence, low detection efficiency, and are large in size and inconvenient.

[0003] With the development of the industry, some portable pesticide residue detection equipment has gradually emerged. For example, the utility model patent with the publication number CN216900223 and the patent name of a pesticide residue qualitative and quantitative integrated intelligent detection equipment discloses a pesticide residue detection equipment. According to its specification and drawings, the integrated intelligent detection equipment is provided with a first turntable, a second turntable, and a liquid adding module. The upper end surface of the first turntable is provided with a sample liquid tank and a reagent tank, and the upper end surface of the second turntable is provided with a reaction tank. The liquid adding module is arranged outside the two turntables and located between the two turntables. The liquid sample in the sample liquid tank and the reagent tank is transferred to the reaction tank through the liquid adding module, and the pesticide residue detection is performed after the reaction. However, the device is equipped with two parallel circular turntables, and the liquid adding module is installed between the two circular turntables. It needs to be equipped with multiple drive motor components, which will have the disadvantages of complex structure, large occupied area, and high implementation cost. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present invention provides a test liquid sample preparation mechanism for pesticide residue detection. On the basis of realizing automated preparation of liquid samples for pesticide residue detection, the structural design is more reasonable, the footprint is small, the volume is small, and the detection cost is lower.

[0005] To achieve the above object, the present invention provides a test liquid sample preparation mechanism for pesticide residue detection, comprising: a main control device, a liquid sample storage and access device and a conveying device electrically connected to the main control device.

[0006] The liquid sample storage and access device comprises a first storage module, a second storage module and a liquid sample transfer module.

[0007] The first storage module includes a sample tray, a reaction tray and a first driving component; the sample tray is provided with a plurality of sample positions and a sample loading window, the sample position is used to place a sample bottle; the reaction tray is installed below the sample tray, the reaction tray is provided with a plurality of cuvette positions, the cuvette positions are used to place a cuvette, the cuvette positions and the sample loading windows correspond one to one, and the liquid sample is injected into the cuvette through the sample loading window; the first driving component is arranged below the sample tray and fixedly connected to the sample tray, the first driving component is used to drive the sample tray to rotate, so as to drive the sample bottle thereon to rotate, and the rotation of the sample tray drives the reaction tray below it to rotate, so as to drive the cuvette on the reaction tray to rotate.

[0008] The second storage module comprises a reagent tray, on which a plurality of reagent positions are arranged, and the reagent positions are used to store enzymes or reagents, and an axial hole is arranged at the center of the reagent tray.

[0009] The liquid sample transfer module includes a mechanical arm, a liquid adding needle and a second driving component; the liquid adding needle is installed at the first end of the mechanical arm, and is used to extract and release the liquid sample; the first end of the mechanical arm passes through the axial hole of the reagent disk, so that the liquid adding needle is located above the reagent position; the second driving component is installed below the reagent disk and connected to the second end of the mechanical arm, and the second driving component is used to drive the mechanical arm to rise or fall or rotate, so as to drive the liquid adding needle to rise or fall or rotate.

[0010] The conveying device is connected to the liquid adding needle through a pipeline, and is used to drive the liquid adding needle to extract or release liquid samples; the first driving component drives the sample plate and the reaction plate to rotate, and the second driving component drives the mechanical arm to drive the liquid adding needle to rise and fall in a timely manner, and drives the mechanical arm to drive the liquid adding needle to rotate in a timely manner, so that the liquid adding needle reaches each of the sample positions, each of the cuvette positions, and each of the reagent positions to extract or release liquid samples.

[0011] In an optional embodiment, the sample disk is a disk, a plurality of the sample positions are annularly distributed on the edge of the disk, and a plurality of the sample addition windows are annularly distributed on the inner side of the sample positions; the reagent disk is crescent-shaped, the reagent disk and the sample disk are arranged side by side, a plurality of reagent positions are arc-shapedly distributed on the side of the reagent disk away from the sample disk, and an arc-shaped portion concave toward the center of the reagent disk is provided on the side of the reagent disk close to the sample disk; the circumferential outer edge of the sample disk is mounted in cooperation with the arc-shaped portion of the reagent disk, and there is a gap between the two; the robotic arm drives the liquid addition needle to move on the reagent disk When the robot arm drives the adding needle to rotate to the first preset position outside the reagent disk, the sample disk is driven to rotate, so as to drive the sample bottles on the sample positions to move to the bottom of the adding needle in sequence, so as to inject or extract liquid samples; when the robot arm drives the adding needle to rotate to the second preset position outside the reagent disk, the sample disk is driven to rotate, driving the reaction disk to rotate, so as to drive the cuvettes on the cuvette positions to move to the bottom of the adding needle in sequence, so as to inject or extract liquid samples.

[0012] In an optional embodiment, the circumferential outer edge of the sample tray is provided with an abutment platform; the first storage module also includes a sample holding slot and a cuvette holding slot; the sample holding slot is located below the sample tray, and the top of its outer ring side wall abuts against the abutment platform of the sample tray; the sample holding slot has a first annular space; the opening of the first annular space faces each of the sample positions, and is used to accommodate and provide a rotation space for the sample bottle; the cuvette holding slot is located below the cuvette tray and on the inner side of the sample holding slot, and has a second annular space; the opening of the second annular space faces each of the cuvette positions, and is used to accommodate and provide a rotation space for the cuvette; an annular heating plate is provided on the side wall of the cuvette holding slot, and is used to maintain the reaction temperature of the test liquid in the cuvette.

[0013] In an optional embodiment, the reaction disk is provided with a plurality of detection ports along its radial direction, and each detection port corresponds one-to-one to each cuvette position; a first detection window is provided on the outer wall of the cuvette holding groove, and a second detection window is provided on the inner wall thereof, and the first detection window and the second detection window are respectively located on both sides of the cuvette position; the transmitting end of the spectrophotometer, the cuvette, and the receiving end of the spectrophotometer are sequentially arranged along the radial direction of the reaction disk.

[0014] In an optional embodiment, the sample tray is provided with an axial hole at its center; the first driving assembly comprises a first motor, a first synchronous wheel, a second synchronous wheel, a first synchronous belt, a first bearing frame, a first bearing, a second bearing and a first rotating shaft; the first motor is mounted below the sample tray; the first synchronous wheel is sleeved on the output shaft of the first motor; the second synchronous wheel is arranged side by side with the first synchronous wheel and is connected by the first synchronous belt transmission; the first bearing is mounted on the first bearing frame and is located above the second synchronous wheel; the second bearing is mounted on the first bearing frame and is located below the second synchronous wheel; the first rotating shaft is mounted on the first bearing frame through the first bearing and the second bearing, the upper end of the first rotating shaft sequentially passes through the axis of the first bearing and the axial hole of the sample tray and is fixedly connected to the sample tray, the lower end of the first rotating shaft sequentially passes through the axis of the second synchronous wheel and the axis of the second bearing and is installed, and is driven to rotate by the second synchronous wheel; the output shaft of the first motor rotates, driving the first synchronous wheel to rotate, driving the second synchronous wheel to rotate synchronously through the first synchronous belt, and the second synchronous wheel drives the first rotating shaft to rotate, so as to drive the sample tray and the reaction tray to rotate.

[0015] In an optional embodiment, the second driving assembly also includes a second motor, a third synchronous wheel, a fourth synchronous wheel, a second synchronous belt, a second bearing frame, a third bearing, a fourth bearing and a bushing; the mechanical arm includes a second rotating shaft and a cantilever, the upper end of the second rotating shaft is mounted with the liquid adding needle through the cantilever, the outer wall of the second rotating shaft is provided with a vertical slide groove along its axial direction, and the height of the vertical slide groove is the same as the lifting height of the liquid adding needle; the second motor is installed below the reagent disk; the third synchronous wheel is sleeved on the output shaft of the second motor; the fourth synchronous wheel is arranged side by side with the third synchronous wheel and is connected through the third synchronous belt transmission; the fourth synchronous wheel is provided with a fastening groove along its radial direction, and a steel ball and an elastic fastener are provided in the fastening groove; the third bearing is installed on the second bearing frame and is located above the fourth synchronous wheel; the fourth bearing is installed in the The second bearing frame is on the second bearing frame and is located below the fourth synchronous wheel; the second rotating shaft sleeve is provided with the sleeve, the second rotating shaft and the sleeve are installed on the second bearing frame through the third bearing and the fourth bearing, the upper end of the second rotating shaft and the sleeve pass through the axis of the third bearing and the axial hole of the reagent disk in turn and extend upward, the lower end of the second rotating shaft passes through the axis of the fourth synchronous wheel and the axis of the fourth bearing in turn and is installed, and is driven to rotate by the fourth synchronous wheel; a radial through hole is provided on the sleeve; the elastic fastener passes through the radial through hole to push the steel ball, and tightens the steel ball into the vertical slide groove of the second rotating shaft; the output shaft of the second motor rotates, driving the third synchronous wheel to rotate, and driving the fourth synchronous wheel to rotate synchronously through the second synchronous belt, and the fourth synchronous wheel drives the second rotating shaft, the sleeve, the second rotating shaft, and the liquid adding needle to rotate.

[0016] In an optional embodiment, the second driving component also includes a lifting unit, which includes a connecting block, a lifting motor, a slider and a guide rail; so a first connecting hole and a second connecting hole are arranged side by side on the connecting block; the lifting motor is installed above the connecting block, and the screw rod of the lifting motor extends downward and passes through the second connecting hole and is fixedly installed with the connecting block; the guide rail is installed in parallel with the screw rod of the lifting motor; one side of the slider is slidably installed in cooperation with the guide rail, and the other side is fixedly installed with the connecting block; the lower end of the second rotating shaft passes through the first connecting hole and is fixedly installed with the connecting block through the first connecting hole; when the screw rod of the lifting motor moves up and down, it drives the slider to slide on the guide rail, and drives the connecting block, the second rotating shaft and the filling needle to rise and fall, and the vertical slide groove of the second rotating shaft and the steel ball produce relative movement.

[0017] In an optional embodiment, a needle washing position is further provided on the reagent disk, and the needle washing position is adjacent to the reagent position and is used for installing a cleaning device.

[0018] In an optional embodiment, the conveying device includes a first valve, a buffer zone, a second valve and a plunger pump which are connected in sequence; the first valve is connected to the liquid-filling needle through a pipeline; when the liquid sample is extracted, the plunger pump operates to provide suction, and the liquid sample is extracted into the buffer zone through the second valve, the first valve and the liquid-filling needle; when the liquid sample is injected, the plunger pump operates to provide thrust, and the liquid sample stored in the buffer zone is released through the second valve, the first valve and the liquid-filling needle.

[0019] The test liquid sample preparation mechanism for pesticide residue detection of the present invention has the following beneficial effects:

[0020] Compared with traditional pesticide residue detection schemes, the technical scheme of this embodiment automatically realizes the functional steps of liquid sample preparation, liquid sample transfer, reagent (reaction reagent, color developer, substrate and other reagents) or enzyme addition, test liquid mixing, substrate addition, etc. through the cooperation of the liquid sample storage and access device and the conveying device. It no longer relies on the professional operation of professional technicians to prepare the test liquid sample, and has a reasonable structural design, small footprint and volume, stronger convenience and environmental adaptability, and low pesticide residue detection cost.

[0021] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

[0022] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of an intelligent pesticide residue detection device provided by an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the internal structure of a smart pesticide residue detection device provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of a sample tray provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the installation of a first drive assembly provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the installation of a reaction disk provided in an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of installing a first storage module provided in an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the structure of a sample tray provided in an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of the structure of a reaction disk provided in an embodiment of the present invention;

[0031] Fig. 9 A schematic diagram of the structure of a cuvette containing tank provided in an embodiment of the present invention;

[0032] Fig.10 A schematic diagram of a driving structure of a second rotating shaft provided in an embodiment of the present invention;

[0033] Fig.11 A schematic diagram of the structure of a second storage module provided in an embodiment of the present invention;

[0034] Fig.12 A cross-sectional schematic diagram of a second storage module and a liquid sample transfer module provided in an embodiment of the present invention;

[0035] Fig.13 A schematic diagram of the installation of the reagent bottle in-situ detection provided by an embodiment of the present invention;

[0036] Fig.14 A schematic diagram of the installation between the second rotating shaft, the shaft sleeve and the fourth synchronous wheel provided in an embodiment of the present invention;

[0037] Fig.15 A schematic diagram of the working principle of the conveying device provided in an embodiment of the present invention.

[0038] Figure Number:

[0039] 1. Box body; 11. Frame; 12. Base; 2. Liquid sample storage and access device; 21. First storage module; 211. Sample tray; 212. First decorative sticker; 2111. Sample position; 2112. Sample loading window; 2113. Abutment platform; 2114. Recessed portion; 2115. Mounting platform; 212. Reaction tray; 2121. Partition; 2122. Protrusion; 2123. Cuvette position; 2124. Detection port; 2125. Silicone sleeve; 213. First drive assembly; 2131. First motor; 2132. First synchronous Step wheel; 2133, second synchronous wheel; 2134, first synchronous belt; 2135, first rotating shaft; 21351, clamping part; 2136, first bearing; 2137, second bearing; 214, sample holding tank; 215, cuvette holding tank; 22, second storage module; 221, reagent tray; 2211, reagent position; 2212, in-situ detection tank; 23, liquid sample transfer module; 231, mechanical arm; 2311, second rotating shaft; 23111, vertical slide; 232, liquid adding needle; 233, second driving assembly ; 2331, second motor; 2332, third synchronous wheel; 2333, fourth synchronous wheel; 23331, fastening groove; 2334, second synchronous belt; 2336, third bearing; 2337, fourth bearing; 2338, bushing; 2335, lifting unit; 23351, connecting block; 23352, lifting motor; 23353, slider; 23354, guide rail; 3, detection device; 31, spectrophotometer; 32, photoelectric sensor; 4, result output device; 5, enzyme storage device; 51, storage box; 52. Enzyme storage bottle; 53. Semiconductor refrigeration chip; 54. Heat sink; 55. Temperature sensor; 6. Cleaning device; 71. First bracket; 711. First vertical plate; 712. First motor mounting plate; 713. First bearing frame; 714. First detection mounting frame; 715. Second detection mounting frame; 72. Second bracket; 721. Second vertical plate; 722. Second motor mounting plate; 723. Second bearing frame; 81. Clean water bottle; 82. Buffer solution bottle; 83. Waste water bottle; 200. Sample bottle; 300. Cuvette. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0043] The embodiment of the present invention discloses a test liquid sample preparation mechanism for pesticide residue detection, which is suitable for pesticide residue detection in diversified scenarios such as agricultural product quality supervision and inspection, sanitation and epidemic prevention, environmental protection, industrial and commercial management, and vegetable wholesale markets, and uses an automated method to realize the steps of liquid sample transfer, reagent injection, liquid sample shaking and mixing, enzyme addition, substrate addition, and quantitative detection of pesticide residues at each stage. The test liquid sample preparation mechanism for pesticide residue detection is suitable for the detection of organophosphorus, carbamates, and other pesticide residue components.

[0044] The test liquid sample preparation mechanism used for pesticide residue detection includes: a main control device (not shown), a liquid sample storage and access device electrically connected to the main control device, and a conveying device.

[0045] In order to improve the transfer convenience, ease of use, and environmental adaptability of the test liquid sample preparation mechanism used for pesticide residue detection, the test liquid sample preparation mechanism can be set in a box body 1, and the box body 1 includes an upper cover (not shown), a frame 11 and a base 12, which are installed in cooperation with each other from top to bottom to form the box body 1.

[0046] In this embodiment, the test liquid sample preparation mechanism is an important component of the intelligent pesticide residue detection device. The intelligent pesticide residue detection device also includes: a detection device and a result output device arranged in the box.

[0047] A communication connection is established between the main control device of the liquid sample preparation mechanism to be tested and the liquid sample storage and access device 2, the conveying device, the detection device 3, and the result output device 4. The communication connection mode can be an unlimited communication mode or a wired communication mode to realize real-time interaction during the pesticide residue detection process. For example, the liquid sample storage and access device 2, the conveying device, the detection device 3, and the result output device 4 can receive a control signal sent by the main control device, or feed back a detection signal to the main control device. In this embodiment, the form of the main control device is not limited. It can be a control panel dedicated to realizing the control of each stage of pesticide residue detection, or it can be other intelligent devices, such as general-purpose computers, smart tablets, smart phones, smart bracelets, industrial computers and other intelligent devices, and can also be cloud servers or other virtual computers. In this embodiment, the main control device is a control panel arranged in the box 1.

[0048] Combination Figures 2 to 6 From the perspective of the liquid sample storage and access device 2, the first storage module 21, the second storage module 22 and the liquid sample transfer module 23 are included. The first storage module 21 includes a sample tray 211, a reaction tray 212 and a first driving assembly 213; the sample tray 211 is provided with a plurality of sample positions 2111 and a plurality of sample loading windows 2112, the sample positions 2111 are used to place the sample bottles 200, specifically, there can be 18 sample positions 2111; the reaction tray 212 is installed and fixed below the sample tray 211, and the reaction tray 212 can be driven to rotate by the sample tray 211. The reaction tray 212 is provided with a plurality of cuvette positions 2123, the plurality of cuvette positions 2123 are used to place the cuvette 300, the cuvette positions 2123 and the sample loading windows 2112 correspond one to one, specifically, there can be 18 cuvette positions 2123 and 18 sample loading windows 2112, and the liquid sample is injected into the cuvette 300 through the sample loading windows 2112. The reaction disk 212 is provided with a plurality of cuvettes 300 to realize multi-channel synchronous detection, obtain multi-channel detection data, and improve detection efficiency and detection accuracy.

[0049] Combination Figure 7 , Figure 8 From the above, the reaction tray 212 and the sample tray 211 are both provided with screw holes, and the reaction tray 212 and the sample tray 211 can be fixedly installed by screws, or fixedly connected by mutually matching structures. Optionally, a plurality of recessed portions 2114 are provided on the side of the sample tray 211 close to the reaction tray 212, and a plurality of protrusions 2122 are provided on the side of the reaction tray 212 close to the sample tray 211, and the shape of the protrusions 2122 corresponds to the shape of the recessed portions 2114, so that the reaction tray 212 and the sample tray 211 can be matched and installed stably.

[0050] Optional, such as Figure 5 , Figure 8As shown, every two cuvette positions 2123 of the reaction disk 212 are separated by a partition 2121, and a protrusion 2122 is provided on the top of each partition 2121; the shape of the recessed portion 2114 and the protrusion 2122 can be triangular, and a silicone sleeve 2125 is provided on the protrusion 2122 to make the protrusion 2122 and the recessed portion 2114 fit more tightly.

[0051] Combination Figures 2 to 6 From the perspective of the embodiment, the first driving assembly 213 is disposed below the sample tray 211 and is fixedly connected to the sample tray 211. The first driving assembly 213 is used to drive the sample tray 211 to rotate and drive the sample bottle 200 thereon to rotate, so as to rotate the sample bottle 200 to a suitable position, which is convenient for adding buffer, reagent (reaction reagent, color developer, substrate and other reagents), enzyme, and transferring the liquid to be tested to the cuvette 300. At the same time, the rotation of the sample tray 211 can also shake the liquid sample in the sample bottle 200 at various stages. The rotation of the sample tray 211 drives the reaction tray 212 thereunder to rotate, so as to drive the cuvette 300 on the reaction tray 212 to rotate to a suitable position, so as to transfer the liquid sample soaked with the test object to the cuvette 300, to add the color developer or enzyme, or to clean the cuvette 300.

[0052] like Figures 9 to 12 As shown, the second storage module 22 includes a reagent tray 221, on which a plurality of reagent positions 2211 are arranged. The reagent positions 2211 are used to store enzymes or reagents. An axial hole is arranged at the center of the reagent tray 221 for installing a robotic arm 231. The robotic arm 231 can drive the liquid adding needle 232 to rotate to reach the reagent position of the reagent tray 221.

[0053] In order to achieve stable installation of reagent bottles, each reagent position 2211 is a circular hole, and a bottle sleeve is installed below the circular hole. The upper end of the bottle sleeve is installed through the circular hole and fixed with screws, and a cylindrical accommodating cavity is provided in the bottle sleeve for placing reagent bottles or test tubes.

[0054] Optional, such as Fig.12 As shown, in order to realize the in-situ detection of reagent bottles, an in-situ detection groove 2212 facing each reagent position 2211 is provided on the side of the reagent tray 221 close to the base, and a photoelectric sensor 32 is installed in the in-situ detection groove 2212 for performing in-situ detection on the reagent bottles, test tubes, or enzyme storage bottles 52 at each reagent position 2211.

[0055] The liquid sample transfer module 23 includes a mechanical arm 231, a liquid adding needle 232 and a second driving component 233; the liquid adding needle 232 is installed at the first end of the mechanical arm 231, and is used to extract and release the liquid sample; the first end of the mechanical arm 231 passes through the axial hole of the reagent disk 221, so that the liquid adding needle 232 is located above the reagent position 2211; the second driving component 233 is installed below the reagent disk 221 and connected to the second end of the mechanical arm 231, and the second driving component 233 is used to drive the mechanical arm 231 to rise or fall or rotate, so as to drive the liquid adding needle 232 to rise or fall or rotate. Specifically, the mechanical arm 231 drives the liquid adding needle 232 to rotate with the axial hole of the reagent disk 221 as the center and the horizontal distance between the axial hole and the liquid adding needle 232 as the radius, that is, the liquid adding needle 232 moves along the circumference of the preset circle.

[0056] The conveying device is connected to the liquid adding needle 232 through a pipeline, and is used to drive the liquid adding needle 232 to extract or release liquid samples at each sample position 2111 , each cuvette position 2123 , and each reagent position 2211 .

[0057] The first driving component 213 drives the sample disk 211 and the reaction disk 212 to rotate, and the second driving component 233 drives the mechanical arm 231 to drive the liquid adding needle 232 to rise and fall in time, and drives the mechanical arm 231 to drive the liquid adding needle 232 to rotate along the circumference of a preset circle in time, so that the liquid adding needle 232 reaches each sample position 2111, each cuvette position 2123, and each reagent position 2211 to extract or release liquid samples.

[0058] Compared with traditional pesticide residue detection schemes, the technical scheme of this embodiment automatically realizes the functional steps of liquid sample preparation, liquid sample transfer, reagent (reaction reagent, color developer, substrate and other reagents) or enzyme addition, test liquid mixing, substrate addition, etc. through the cooperation of the liquid sample storage and access device and the conveying device. It has a high degree of intelligence and high efficiency in liquid sample preparation. It no longer relies on the professional operation of professional technicians to prepare the test liquid sample. In addition, the structural design is reasonable, the footprint is small, the volume is small, the convenience is stronger, the environmental adaptability is stronger, and the cost of pesticide residue detection is low.

[0059] The following is a detailed description of each device of the test liquid sample preparation mechanism used for pesticide residue detection.

[0060] In order to save space in the box, an ingenious structural design is carried out based on the number of detection channels required and the amount of reagents required to be added.

[0061] In this embodiment, Figure 2-Figure 8As shown, the sample tray 211 is configured as a circular tray, which can be driven to rotate, and a plurality of sample positions 2111 are distributed in a ring around the edge of the circular tray, specifically, 18 equidistant sample positions 2111. When the sample bottle 200 is placed in the sample position 2111, the opening faces upward. On the sample tray 211, a plurality of sample loading windows 2112 are distributed in a ring around the inner side of the sample position 2111, specifically, 18 equidistant sample loading windows 2112. Optionally, a first decorative sticker 212 is also attached to the upper surface of the sample tray 211 facing the upper cover, and the first decorative sticker 212 is marked with the number of the sample position 2111 and / or the number of the cuvette position 2123.

[0062] like Figure 2 , Fig. 9 , Fig.12 As shown, the reagent tray 221 is crescent-shaped, and the reagent tray 221 and the sample tray 211 are arranged side by side. The reagent tray 221 cannot rotate, and the sample tray 211 can rotate. A plurality of reagent positions 2211 are distributed in an arc shape on the side of the reagent tray 221 away from the sample tray 211, and each reagent position 2211 is arranged equidistantly along the arc, so that the liquid adding needle 232 is more easily controlled to be transferred to each reagent position 2211. Optionally, five reagent positions 2211 are arranged on the reagent tray 221, and one of the reagent positions 2211 is used for enzyme storage. An arc portion concave to the center of the reagent tray 221 is provided on the side of the reagent tray 221 close to the sample tray 211; the circumferential outer edge of the sample tray 211 is installed in cooperation with the arc portion of the reagent tray 221, and there is a small gap between the two, so that the sample tray 211 can rotate freely, so that the mechanical arm 231 can drive the liquid adding needle 232 to rotate and move to each sample bottle 200, cuvette 300, and reagent bottle to absorb or release liquid samples. Optionally, a second decorative sticker is attached to the upper surface of the reagent disk 221 facing the upper cover, and the second decorative sticker is marked with the reagent position 2211 number, the cleaning tank mark, and / or the enzyme storage mark.

[0063] Specifically, when the robotic arm 231 drives the liquid adding needle 232 to rotate on the reagent disk 221, the liquid adding needle 232 reaches each reagent position 2211 to extract the reagent; the robotic arm 231 drives the liquid adding needle 232 to rotate to the first preset position outside the reagent disk 221 ( Figure 2 3 sample position in the reagent tray), the sample tray 211 is driven to rotate, so as to drive the sample bottles 200 on the sample position 2111 to move to the bottom of the liquid adding needle 232 in sequence, so as to inject or extract the liquid sample; the mechanical arm 231 drives the liquid adding needle 232 to rotate to the second preset position outside the reagent tray 221 ( Figure 2 When the reagent position 2211 is at the first preset position, the sample disk 211 is driven to rotate, driving the reaction disk 212 to rotate, so as to drive the cuvettes 300 on the cuvette positions 2123 to move to the bottom of the liquid adding needle 232 in sequence, so as to inject or extract the liquid sample. Among them, each reagent position 2211, the first preset position, and the second preset position are all on the circumference of the same preset circle.

[0064] At the same time, the circumferential outer edge of the sample disk 211 is tightly fitted with the arc portion of the reagent disk 221, which can reduce the rotation radius of the robot arm 231 and the platform area, thereby reducing the volume of the box 1, saving floor space, facilitating carrying and transport, and reducing requirements for the detection environment.

[0065] The sample bottle 200 and the cuvette 300 are prone to shaking when they are driven to rotate, and severe shaking may also cause detection interruption. In order to prevent the sample bottle 200 and the cuvette 300 from shaking during rotation and improve the structural stability of the equipment, it is also necessary to configure a corresponding stable structure to accommodate the sample bottle 200 and the cuvette 300. Preferably, the circumferential outer edge of the sample tray 211 is provided with an abutment platform 2113. The first storage module 21 also includes a sample holding groove 214 and a cuvette holding groove 215. The sample holding groove 214 is located below the sample tray 211 and cannot rotate, and the top of its outer ring side wall abuts against the abutment platform 2113 on the circumferential outer edge of the sample tray 211, and the sample holding groove 214 has a first annular space; the opening of the first annular space faces each sample position 2111, which is used to accommodate and provide a rotation space for the sample bottle 200. The cuvette holding slot 215 is located below the reaction disk 212 and on the inner side of the sample holding slot 214. It is non-rotatable and has a second annular space. The opening of the second annular space faces each cuvette position 2123, and is used to hold and provide a rotation space for the cuvette 300. An annular heating plate is provided on the outer wall of the cuvette holding slot 215, which is used to maintain the reaction temperature of the test liquid in the cuvette 300 and provide a constant temperature reaction condition to ensure the activity of the enzyme.

[0066] Optionally, the pesticide residue detection equipment is used to achieve spectroscopic detection, such as Figure 8 As shown, the reaction disk 212 is provided with a plurality of detection ports 2124 along its radial direction, and each detection port 2124 corresponds to each cuvette position 2123 one by one; a first detection window 2151 is provided on the outer wall of the cuvette receiving groove 215, and a second detection window 2152 is provided on the inner wall thereof, and the first detection window 2151 and the second detection window 2152 are respectively located on both sides of the cuvette position 2123. During detection, it is necessary to drive the sample disk 211 to rotate, drive the reaction disk 212 and the cuvette 300 thereon to rotate, so that the cuvette 300 containing the liquid to be tested is located on the same straight line at the first detection window 2151 and the second detection window 2152, so as to facilitate spectroscopic detection.

[0067] From the perspective of pesticide residue detection, Figure 6 , Fig. 9As shown, a third detection window 2153 is provided on the outer wall of the cuvette holding tank 215, and the spectrophotometer 31 of the detection device 3 includes a transmitting end and a receiving end, and the transmitting end, the cuvette 300, and the receiving end are sequentially arranged along the radial direction of the reaction disk 212; the light signal emitted by the transmitting end irradiates the test liquid in the cuvette 300 through the third detection window 2153 of the cuvette holding tank 215 and the detection port 2124 of the reaction disk 212, and the receiving end receives the detection signal through the detection port 2124 of the reaction disk 212 and the second detection window of the cuvette holding tank 215.

[0068] To achieve in-situ detection of the cuvette 300 , the detection device 3 optionally includes a photoelectric sensor 32 for performing in-situ detection of the cuvette 300 ; the photoelectric sensor 32 passes through the second detection window and the detection port 2124 of the reaction disk 212 to perform in-situ detection of the cuvette 300 .

[0069] In order to realize the rotation of the sample disk 211 and the reaction disk 212 , this embodiment is realized by the following structure.

[0070] The sample tray 211 is provided with an axial hole at its center; the first driving assembly 213 includes a first motor 2131 , a first synchronous wheel 2132 , a second synchronous wheel 2133 , a first synchronous belt 2134 , a first bearing 2136 frame, a first bearing 2136 , a second bearing 2137 and a first rotating shaft 2135 .

[0071] The first motor 2131 is installed below the sample plate 211; the first synchronous wheel 2132 is sleeved on the output shaft of the first motor 2131; the second synchronous wheel 2133 is arranged side by side with the first synchronous wheel 2132 and is connected through the first synchronous belt 2134; the first bearing 2136 is installed on the first bearing 2136 frame and is located above the second synchronous wheel 2133; the second bearing 2137 is installed on the first bearing 2136 frame and is located below the second synchronous wheel 2133.

[0072] The first rotating shaft 2135 is installed on the first bearing 2136 frame through the first bearing 2136 and the second bearing 2137. The upper end of the first rotating shaft 2135 passes through the axis of the first bearing 2136 and the axis hole of the sample tray 211 in sequence and is fixedly connected to the sample tray 211. The lower end of the first rotating shaft 2135 passes through the axis of the second synchronous wheel 2133 and the axis of the second bearing 2137 in sequence and is installed, and is driven to rotate by the second synchronous wheel 2133. Optionally, the axis hole of the sample tray 211 is a limit axis hole, and a mounting platform 2115 is provided at the limit axis hole. The upper end of the first rotating shaft 2135 is provided with a clamping portion 21351 matching the mounting platform 2115. The upper end of the first rotating shaft 2135 is provided with a screw hole for installing a cap.

[0073] The output shaft of the first motor 2131 rotates, driving the first synchronous wheel 2132 to rotate, and the second synchronous wheel 2133 to rotate synchronously through the first synchronous belt 2134. The second synchronous wheel 2133 drives the first rotating shaft 2135 to rotate, thereby driving the sample disk 211 and the reaction disk 212 to rotate.

[0074] In order to realize the rotation of the mechanical arm 231 and the liquid adding needle 232 , this embodiment is realized by the following structure.

[0075] The second driving assembly 233 further includes a second motor 2331 , a third synchronous wheel 2332 , a fourth synchronous wheel 2333 , a second synchronous belt 2334 , a second bearing 2137 frame, a third bearing 2336 , a fourth bearing 2337 and a sleeve 2338 .

[0076] The mechanical arm 231 includes a second rotating shaft 2311 and a cantilever, the upper end of the second rotating shaft 2311 is mounted with a liquid adding needle 232 through the cantilever, and the outer wall of the second rotating shaft 2311 is provided with a vertical slide groove 23111 along its axial direction, and the height of the vertical slide groove 23111 is the same as the lifting height of the liquid adding needle 232. The length of the cantilever is equal to the radius of a preset circle, and the preset circle takes the axial hole of the reagent disk 221 as the center, and the horizontal distance between the axial hole and the liquid adding needle 232 is the radius.

[0077] The second motor 2331 is installed under the reagent disk 221 through the second motor mounting plate 722; the third synchronous wheel 2332 is sleeved on the output shaft of the second motor 2331; the fourth synchronous wheel 2333 is arranged side by side with the third synchronous wheel 2332 and is connected through the third synchronous belt transmission. Fig.14 As shown, the fourth synchronous wheel 2333 is provided with a fastening groove 23331 along its radial direction, and a steel ball 23332 and an elastic fastener (not shown) are arranged in the fastening groove 23331. The third bearing 2336 is mounted on the second bearing 2137 frame and is located above the fourth synchronous wheel 2333; the fourth bearing 2337 is mounted on the second bearing 2137 frame and is located below the fourth synchronous wheel 2333; the second rotating shaft 2311 is sleeved with a sleeve 2338, and the second rotating shaft 2311 and the sleeve 2338 are mounted on the second bearing 2137 frame through the third bearing 2336 and the fourth bearing 2337. The upper end of the second rotating shaft 2311 and the sleeve 2338 pass through the axis of the third bearing 2336 and the axial hole of the reagent disk 221 in turn and extend upward, and the lower end of the second rotating shaft 2311 passes through the axis of the fourth synchronous wheel 2333 and the axis of the fourth bearing 2337 in turn and is installed, and is driven to rotate by the fourth synchronous wheel 2333.

[0078] like Fig.14As shown, in order to eliminate the rotational clearance between the second rotating shaft 2311 and the sleeve 2338, a radial through hole (blocked by the fourth synchronous wheel 2333) is provided on the sleeve 2338; the elastic fastener passes through the radial through hole to push the steel ball 23332, and the steel ball 23332 is tightly installed in the vertical slide groove 23111 of the second rotating shaft 2311, so that the second rotating shaft 2311 can be driven to rotate or lift.

[0079] The output shaft of the second motor 2331 rotates, driving the third synchronous wheel 2332 to rotate, and driving the fourth synchronous wheel 2333 to rotate synchronously through the second synchronous belt 2334. The fourth synchronous wheel 2333 drives the second rotating shaft 2311, the shaft sleeve 2338, the second rotating shaft 2311, and the liquid adding needle 232 to rotate.

[0080] In order to realize the lifting and lowering of the robot arm 231, Fig.11 , Fig.12 As shown, the second driving assembly 233 also includes a lifting unit 2335 , and the lifting unit 2335 includes a connecting block 23351 , a lifting motor 23352 , a slider 23353 and a guide rail 23354 . Therefore, a first connecting hole and a second connecting hole are arranged side by side on the connecting block 23351; the lifting motor 23352 is installed above the connecting block 23351, and the screw rod of the lifting motor 23352 extends downward and passes through the second connecting hole, and is fixedly connected to the connecting block 23351 through the second connecting hole; the guide rail 23354 is installed in parallel with the screw rod of the lifting motor 23352; one side of the slider 23353 is slidably installed in cooperation with the guide rail 23354, and the other side is fixedly installed with the connecting block 23351; the lower end of the second rotating shaft 2311 is installed through the first connecting hole; when the screw rod of the lifting motor 23352 moves up and down, it drives the slider 23353 to slide on the guide rail 23354, and drives the connecting block 23351, the second rotating shaft 2311 and the liquid adding needle 232 to rise and fall, and the vertical slide groove and the steel ball of the second rotating shaft 2311 produce relative movement.

[0081] In order to clean the liquid adding needle 232, Fig.10As shown, the test liquid sample preparation mechanism is also provided with a cleaning device 6; a needle washing position is also provided on the reagent disk 221, the needle washing position is adjacent to the reagent position 2211, and is located on the circumference of a preset circle; the cleaning device 6 is installed at the needle washing position, and the cleaning device 6 includes a cleaning tank located at the center of the needle washing position, and a water inlet is provided at the bottom of the cleaning tank; the water inlet is connected to the clean water bottle through a pipeline and a conveying device, and a water outlet tank is provided on the circumference of the cleaning tank, and a water outlet is provided at the bottom of the water outlet tank, and the water outlet is connected to the waste water bottle through a pipeline and a conveying device. The liquid adding needle 232 is driven to transfer to the top of the cleaning tank, and is controlled to descend into the cleaning tank. The clean water on the bottom water inlet rinses the liquid adding needle 232, and at the same time, the waste water flows out from the bottom water outlet and is transferred to the waste water bottle by the conveying device. In order to facilitate the rotation control of the liquid adding needle 232, the needle washing position and each reagent position 2211 are installed equidistantly along the arc.

[0082] In order to realize convenient storage of enzymes, the sample preparation mechanism for the test liquid is also provided with an enzyme storage device 5. The enzyme storage device 5 includes a storage box 51, an enzyme storage bottle 52, a semiconductor cooling sheet 53, a heat sink 54, and a temperature sensor (not shown); the storage box 51 is arranged below the reagent tray 221, and a temperature measuring hole (not shown) is arranged at the bottom of the box body, and a mounting window is opened on one side wall of the storage box 51; the semiconductor cooling sheet 53 is installed in the mounting window; the enzyme storage bottle 52 is placed in the storage box 51, and corresponds to one of the reagent positions 2211 on the reagent tray 221; the heat sink 54 is installed on the outside of the storage box 51, and is adjacent to the semiconductor cooling sheet 53; the temperature sensor is arranged in the temperature measuring hole, and is used to detect the temperature of the semiconductor cooling sheet 53.

[0083] In order to realize the transportation of liquid samples, the test liquid sample preparation mechanism also includes a transportation device for realizing the extraction, transfer and release of clean water, the extraction, transfer and release of liquid samples, the extraction, transfer and release of reagents, and the extraction, transfer and release of enzymes.

[0084] The conveying device includes a first valve (valve No. 3), a buffer zone, a second valve (valve No. 4) and a plunger pump which are connected in sequence; the first valve and the second valve are both three-way valves. Among them, the first channel of the first valve is connected to the liquid adding needle 232 through a pipeline, the second channel is connected to the first waste liquid motor through a pipeline, and the third channel is connected to the buffer zone through a pipeline. The first channel of the second valve is connected to the buffer zone through a pipeline, the second channel is connected to the plunger pump, and the third channel is connected to the peristaltic pump through a pipeline. When the liquid sample is extracted, the plunger pump operates to provide suction, and the liquid sample is extracted into the buffer zone through the second valve, the first valve, and the liquid adding needle 232; when the liquid sample is released, the plunger pump operates to provide thrust, and the liquid sample stored in the buffer zone is released through the second valve, the first valve, and the liquid adding needle 232. When the liquid sample is extracted and transferred, the liquid adding needle 232 needs to rotate in coordination, and the sample disk 211 and the reaction disk 212 need to rotate in coordination.

[0085] In order to prevent the plunger pump from dry grinding and affecting its service life, the plunger pump needs to be sucked with water each time it is turned on. Optionally, the conveying device also includes a clean water valve and a third valve (valve No. 5), and the clean water valve and the third valve are both three-way valves. The first channel of the third valve is connected to the first channel of the clean water valve through a pipeline, its second channel is connected to the plunger pump, and its third channel is suspended.

[0086] The water inlet of the plunger pump is connected to the clean water bottle through a pipeline, a third valve, and a clean water valve. When the plunger pump absorbs water, the second channel connected to the third valve and the plunger pump is opened, the third channel connected to the clean water valve and the clean water bottle is opened, the plunger pump operates, and absorbs water through the third valve and the clean water valve.

[0087] During the entire pesticide residue detection process, the dosing needle 232 needs to be cleaned. Optionally, the conveying device also includes a clean water motor, a first waste liquid motor, and a waste liquid valve, and the waste liquid valve is a three-way valve. The first channel of the clean water valve is connected to the clean water motor, the second channel is connected to the external clean water source through a pipeline, and the third channel is connected to the clean water bottle through a pipeline. The first channel of the waste liquid valve is connected to the first waste liquid motor, the second channel is connected to the external waste liquid pool, and the third channel is connected to the waste liquid bottle. The clean water motor runs, and the clean water is delivered to the cleaning tank of the dosing needle 232 through the clean water valve to rinse the dosing needle 232; the first waste liquid motor runs synchronously to transfer the waste liquid to the waste liquid bottle through the waste liquid valve.

[0088] During the preparation of the liquid sample to be tested, it is necessary to clean the cuvette 300. Optionally, the conveying device also includes a second waste liquid motor, one end of which is connected to the second channel of the first valve through a pipeline, and the other end is connected to the first channel of the waste liquid valve through a pipeline. During the cleaning process of the cuvette 300, clean water is sucked by the liquid adding needle 232 and transferred to the cuvette 300 for cleaning. Specifically, when the liquid adding needle 232 sucks clean water, it controls the first channel and the third channel of the clean water valve to be connected, controls the first channel and the second channel of the third valve to be connected, controls the first channel and the second channel of the second valve to be connected, and controls the first channel and the third channel of the first valve to be connected to form a water absorption channel. Control the plunger pump to operate to absorb clean water into the buffer zone, control the liquid adding needle 232 to transfer to the cuvette 300, and the plunger pump operates again to release the clean water in the buffer zone to the cuvette 300, and the cuvette 300 is cleaned. After cleaning, the second waste liquid motor is controlled to operate, the first channel and the second channel of the first valve are controlled to be connected, and the first channel and the third channel of the waste liquid valve are controlled to be connected, so as to transfer the waste liquid in the cuvette 300 to the waste liquid bottle.

[0089] When preparing the test solution, the buffer solution needs to be transferred to the sample bottle 200. To achieve the addition of the buffer solution, the delivery device further includes a peristaltic pump, a buffer solution valve, a fourth valve (valve No. 1) and a fifth valve (valve No. 2), and the buffer solution valve, the fourth valve (valve No. 1) and the fifth valve are all three-way valves.

[0090] The first channel and the third channel of the buffer valve are controlled to be connected, so that the buffer valve is connected to the buffer bottle, the first channel and the second channel of the fifth valve are controlled to be connected, the first channel and the third channel of the fourth valve are controlled to be connected, the first channel and the third channel of the second valve are controlled to be connected, and the peristaltic pump is controlled to operate synchronously to extract the buffer into the buffer. When the liquid adding needle 232 is transferred to the sample bottle 200 to which the buffer needs to be added, the plunger pump is controlled to operate to release the buffer in the buffer into the sample bottle 200. Optionally, there may be a certain amount of air in the buffer, so the air in the buffer needs to be exhausted before the buffer is transferred to the buffer. At this time, it is necessary to control the first channel and the third channel of the second valve to be connected, the first channel and the second channel of the fourth valve to be connected, and the second channel of the fourth valve to be connected. The fourth valve leads to the outside, and the peristaltic pump is controlled to operate, and the air in the buffer is discharged through the second valve, the peristaltic pump, and the fourth valve.

[0091] In an optional embodiment, if Figure 1 , Figure 2 As shown, a first bracket 71, a second bracket 72 and a third bracket (blocked by the box 1) are arranged on the base inside the box 1 of the intelligent detection equipment for pesticide residues. The first bracket 71 is used to install and support the first storage module 21 and the detection device 3, the second bracket 72 is used to install and support the second storage module 22 and the liquid sample transfer module 23, and the third bracket is used to install and support the clean water bottle 81, the buffer bottle 82 and the waste water bottle 83.

[0092] The first bracket 71 is located in the middle of the base, and includes two first vertical plates 711, a first motor mounting plate 2131, a first bearing 2136 frame, a first detection mounting frame 714 and a second detection mounting frame 715. The two first vertical plates 711 are vertically mounted side by side on the base, and the first motor mounting plate 2131 is mounted on the two first vertical plates 711 and supported by the two first vertical plates 711. The first motor mounting plate 2131 is provided with a motor mounting position and a bearing mounting position. The motor mounting position is used to install the first motor 2131, and the bearing mounting position is used to install the bearing and the rotating shaft. The first motor 2131 is installed below the first motor mounting plate 2131, and its output shaft passes through the motor mounting position and is fixedly installed with the first synchronous wheel 2132. The second synchronous wheel 2133 is installed above the first motor mounting plate 2131 and corresponds to the bearing mounting position.

[0093] The first bearing 2136 frame is fixedly mounted on the first motor mounting plate 2131, and the shaft hole on the first bearing 2136 frame corresponds to the bearing mounting position. The first bearing 2136 frame includes a first extension frame and a second extension frame arranged up and down, and the first extension frame and the second extension frame are used to install the first bearing 2136 and the second bearing 2137 respectively.

[0094] The first detection mounting frame 714 is installed on the left side of the first motor mounting plate 2131. The side wall of the first detection mounting frame 714 has a step, which abuts against the edge of the motor mounting frame and is used for screw fixing. The step of the first detection mounting frame 714 abuts against the second extension frame of the first bearing 2136 frame in the horizontal direction. Two vertical brackets are provided on the first detection mounting frame 714, wherein the top of one vertical bracket is supported on the bottom of the cuvette receiving slot 215 and is fixed to the cuvette receiving slot 215 by screws, and the other vertical bracket is pressed against and supports the bottom of the sample receiving slot 214 and is fixed to the sample receiving slot 214 by screws. Optionally, the vertical bracket used to support the cuvette receiving slot 215 is used to install the spectrophotometer 31, and one side of the vertical bracket is used to install the transmitting end of the spectrophotometer 31, and the other side is used to install the receiving end of the spectrophotometer 31. The spectrophotometer 31 is installed corresponding to the first detection window and the second detection window, so as to perform spectrophotometric detection on the liquid to be tested in the cuvette 300 through the two detection windows.

[0095] The second detection mounting frame 715 is located on the right side of the first motor mounting plate 2131, fixed to the first bearing 2136 frame by screws, and arranged in the opposite direction to the first extension frame and the second extension frame. The photoelectric sensor 32 is mounted on the second detection mounting frame 715 and faces the second detection window of the cuvette receiving slot 215, so that the cuvette 300 can be detected in place through the second detection window. Optionally, the second detection mounting frame 715 is fixedly mounted to the sample receiving slot 214 by screws.

[0096] The second bracket 72 is installed on the base, located on the left side of the first bracket 71, and its structure is similar to that of the first bracket 71. Specifically, the second bracket 72 includes two second vertical plates 721, a second motor mounting plate 722, and a second bearing 2137 frame. The two second vertical plates 721 are vertically installed side by side on the base, and the second motor mounting plate 722 is installed on the two second vertical plates 721 and supported by the two second vertical plates 721. The second motor mounting plate 722 is provided with a motor mounting position and a bearing mounting position. The motor mounting position is used to install the second motor 2331, and the bearing mounting position is used to install the bearing and the rotating shaft. The second motor 2331 is installed below the second motor mounting plate 722, and its output shaft passes through the motor mounting position and is fixedly installed with the third synchronous wheel 2332. The third synchronous wheel 2332 is installed above the second motor mounting plate 722 and corresponds to the bearing mounting position.

[0097] Optionally, the guide rail 23354 is vertically installed between the two second vertical plates 721 and supported under the second motor mounting plate 722. When the lifting motor 23352 drives the screw rod and the slider 23353 to slide, the slider 23353 and the guide rail 23354 move relative to each other.

[0098] The following is a detailed description of the steps for preparing the liquid sample for pesticide residue detection.

[0099] The preparation of the liquid sample to be tested may include the following steps: S1: cleaning the liquid adding needle; S2: adding buffer to the sample bottle containing the test object through the liquid adding needle; S3: shaking the test object and buffer in the sample bottle and settling for several minutes; S4: cleaning the sampling needle, then extracting the upper clear liquid in the sample bottle and transferring it to the cuvette; S5: cleaning the liquid adding needle, extracting the enzyme, and adding the enzyme to the cuvette; S6: cleaning the liquid adding needle, extracting the color developer and adding it to the cuvette for stabilization for several minutes; S7: cleaning the liquid adding needle and adding the substrate. It can be seen that in the preparation of the liquid sample to be tested and the detection of pesticide residues, the steps that the sample plate, the reaction plate, and the liquid adding needle need to rotate in coordination include at least S1 to S7.

[0100] Combination Figure 2 From the perspective of FIG. 2 , when cleaning the adding needle 232 , the second motor 2331 drives the adding needle 232 to rotate to the needle washing position through the second rotating shaft 2311 , and the adding needle 232 is rinsed with clean water on the conveying device. After cleaning, the adding needle 232 is transferred to a suitable position.

[0101] When adding buffer, the buffer is first transferred to the buffer through the conveying device, and then the first motor 2131 is controlled to drive the first rotating shaft 2135 to rotate, driving the sample tray 211 to rotate, so that the sample bottle 200 that needs to add buffer is close to the reagent tray 221. When the sample bottle 200 that needs to add buffer and each reagent position 2211 are on the circumference of the same preset circle, the sample tray 211 stops rotating, and then the second rotating shaft 2311 is driven to rotate by the second motor 2331 to drive the liquid adding needle 232 to move above the sample bottle 200 that needs to add buffer, and the buffer stored in the buffer is released through the conveying device and injected into the sample bottle 200 through the liquid adding needle 232. There are a total of 18 sample bottles 200 on the sample tray 211. Rotating the sample tray 211 can make the sample bottles 200 that need to add buffer close to the reagent tray 221 in turn, and add buffer by the above method. After the buffer solution is added, the first motor 2131 drives the first rotating shaft 2135 to rotate, driving the sample plate 211 to rotate so as to shake and mix the buffer solution in the sample bottle 200 with the test object to obtain a test sample solution.

[0102] After the sample liquid to be tested is shaken and left to stand for several minutes, the adding needle 232 is driven to rotate to the needle washing position for cleaning again, and then the adding needle 232 is driven to rotate to the sample position 2111 to extract the sample liquid to be tested from the sample bottle 200 and transfer it to the cuvette 300. Specifically, the second motor 2331 drives the second rotating shaft 2311 to rotate, so as to drive the adding needle 232 to move to the first preset position, that is, to the top of the corresponding sample bottle 200; the lifting motor 23352 drives the adding needle 232 down to the liquid surface of the sample bottle 200; the conveying device drives the adding needle 232 to absorb the sample liquid to be tested and transfer it to the buffer zone; then, the lifting motor 23352 drives the adding needle 232 to rise above the sample bottle 200; the second motor 2331 drives the second rotating shaft 2311 to rotate and drives the adding needle 232 to move to the second preset position, that is, to the top of the corresponding cuvette 300; the lifting motor 23352 drives the adding needle 232 down to the cuvette 300; the conveying device drives the release of the sample liquid to be tested in the buffer zone and injects it into the cuvette 300.

[0103] After the sample liquid to be tested is transferred to the cuvette 300, the adding needle 232 needs to be cleaned before the enzyme can be extracted and added. Specifically, the adding needle 232 is driven to rotate to the needle washing position for cleaning again, and then the adding needle 232 is driven to rotate to the enzyme storage position, and the lifting motor 23352 drives the adding needle 232 to descend to the enzyme storage bottle 52 to extract the enzyme, and then the lifting motor 23352 drives the adding needle 232 to rise away from the enzyme storage bottle 52; the second motor 2331 drives the second rotating shaft 2311 to rotate and drive the adding needle 232 to move to the second preset position, that is, to the top of the corresponding cuvette 300, and the lifting motor 23352 drives the adding needle 232 to descend to the cuvette 300 to inject the enzyme. The addition of the developer and the substrate is realized in sequence in the above manner, and finally the spectrophotometric detection is performed by the detection device 3.

[0104] The test liquid sample preparation mechanism for pesticide residue detection of the present invention has the following beneficial effects:

[0105] In the technical solution of the embodiment of the present invention, the preparation of liquid samples, the transfer of liquid samples, the addition of reagents (reaction reagents, color developers, substrates and other reagents) or enzymes, the mixing of test liquids, the addition of substrates and other functional steps are automatically realized through the cooperation of the liquid sample storage and access device and the conveying device. It is no longer dependent on the professional operation of professional technicians to prepare the test liquid samples. Fewer drive motor components are used, and the structural design is reasonable, with a small footprint and small size, greater convenience and environmental adaptability, and low cost for pesticide residue detection.

[0106] Compared with the structural design of two turntables and a rotating liquid adding needle in the prior art, the technical solution of the present application only needs to adopt two driving motors to drive the rotation, the control method is relatively simple, and the structure is more reasonable. The ingenious structural installation of the sample tray, reaction tray, reagent tray, and mechanical arm of the present application makes it possible to realize the transfer of samples, the addition of reagents at each stage, and the transfer of liquid samples during the entire liquid sample preparation process through the same liquid adding needle, and it is only necessary to control the sample tray, reaction tray, and mechanical arm to rotate in coordination to realize multiple functions, and the control method is simplified; and the footprint of the entire device can be reduced, which helps to reduce the volume of the box and improve the convenience and adaptability of the test liquid sample preparation mechanism used for pesticide residue detection.

[0107] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A test liquid sample preparation mechanism for pesticide residue detection, characterized in that: include: A main control device, a liquid sample storage and access device and a conveying device electrically connected to the main control device; The liquid sample storage and access device comprises a first storage module, a second storage module and a liquid sample transfer module; The first storage module includes a sample tray, a reaction tray and a first driving assembly; the sample tray is provided with a plurality of sample positions and a sample loading window, the sample position is used to place a sample bottle; the reaction tray is installed below the sample tray, the reaction tray is provided with a plurality of cuvette positions, the cuvette positions are used to place cuvettes, the cuvette positions correspond to the sample loading windows one by one, and the liquid sample is injected into the cuvette through the sample loading window; The first driving assembly is disposed below the sample tray and fixedly connected to the sample tray. The first driving assembly is used to drive the sample tray to rotate, so as to drive the sample bottles thereon to rotate. The rotation of the sample tray drives the reaction tray thereunder to rotate, so as to drive the cuvettes on the reaction tray to rotate. The second storage module comprises a reagent tray, on which a plurality of reagent positions are arranged, and the reagent positions are used to store enzymes or reagents, and an axial hole is arranged at the center of the reagent tray; The liquid sample transfer module includes a mechanical arm, a liquid adding needle and a second driving component; the liquid adding needle is installed at the first end of the mechanical arm and is used to extract and release the liquid sample; the first end of the mechanical arm passes through the axial hole of the reagent disk, so that the liquid adding needle is located above the reagent position; the second driving component is installed below the reagent disk and connected to the second end of the mechanical arm, and the second driving component is used to drive the mechanical arm to rise or fall or rotate, so as to drive the liquid adding needle to rise or fall or rotate; The conveying device is in communication with the liquid adding needle and is used to drive the liquid adding needle to extract or release the liquid sample; The first driving component drives the sample disk and the reaction disk to rotate, and the second driving component drives the mechanical arm to drive the liquid adding needle to rise and fall in a timely manner, and drives the mechanical arm to drive the liquid adding needle to rotate in a timely manner, so that the liquid adding needle reaches each of the sample positions, each of the cuvette positions, and each of the reagent positions to extract or release the liquid sample, thereby realizing the preparation of the liquid sample to be tested.

2. The test liquid sample preparation mechanism for pesticide residue detection according to claim 1, characterized in that: The sample disk is a disk, and a plurality of the sample positions are distributed in a ring shape on the edge of the disk, and a plurality of the sample loading windows are distributed in a ring shape inside the sample positions; The reagent disk is crescent-shaped, and is arranged side by side with the sample disk. A plurality of reagent positions are distributed in an arc shape on a side of the reagent disk away from the sample disk, and an arc-shaped portion concave toward the center of the reagent disk is arranged on a side of the reagent disk close to the sample disk. The circumferential outer edge of the sample disk is mounted in cooperation with the arc-shaped portion of the reagent disk, and there is a gap between the two; When the mechanical arm drives the liquid adding needle to rotate on the reagent disk, the liquid adding needle reaches each reagent position to extract the reagent; When the mechanical arm drives the liquid adding needle to rotate to the first preset position outside the reagent disk, the sample disk is driven to rotate, so as to drive the sample bottles on the sample position to move to the bottom of the liquid adding needle in sequence, so as to realize the injection or extraction of liquid samples; When the robotic arm drives the adding needle to rotate to a second preset position outside the reagent disk, the sample disk is driven to rotate, driving the reaction disk to rotate, thereby driving the cuvettes on the cuvette positions to move to the bottom of the adding needle in turn, thereby achieving liquid sample injection or extraction.

3. The test liquid sample preparation mechanism for pesticide residue detection according to claim 2, characterized in that: The circumferential outer edge of the sample plate is provided with an abutment platform; The first storage module also includes a sample holding slot and a cuvette holding slot; The sample holding groove is located below the sample tray, and the top of the outer ring side wall thereof abuts against the abutment platform of the sample tray; The sample holding groove has a first annular space; the opening of the first annular space faces each of the sample positions, and is used to hold and provide a rotation space for the sample bottle; The cuvette holding tank is located below the cuvette plate and inside the sample holding tank, and has a second annular space. The opening of the second annular space faces each of the cuvette positions, and is used to hold and provide a rotation space for the cuvette. An annular heating plate is provided on the side wall of the cuvette holding tank, and is used to maintain the reaction temperature of the test liquid in the cuvette.

4. The test liquid sample preparation mechanism for pesticide residue detection according to claim 3, characterized in that: The reaction disk is provided with a plurality of detection ports along its radial direction, and each detection port corresponds to each cuvette position one by one; A first detection window is arranged on the outer wall of the cuvette containing tank, and a second detection window is arranged on the inner wall thereof. The first detection window and the second detection window are respectively located on two sides of the cuvette position.

5. The test liquid sample preparation mechanism for pesticide residue detection according to claim 2, characterized in that: The center of the sample tray is provided with an axial hole; The first driving assembly includes a first motor, a first synchronous wheel, a second synchronous wheel, a first synchronous belt, a first bearing frame, a first bearing, a second bearing and a first rotating shaft; The first motor is installed below the sample tray; the first synchronous wheel is sleeved on the output shaft of the first motor; the second synchronous wheel is arranged side by side with the first synchronous wheel and is connected through the first synchronous belt transmission; The first bearing is mounted on the first bearing frame and is located above the second synchronous wheel; the second bearing is mounted on the first bearing frame and is located below the second synchronous wheel; The first rotating shaft is installed on the first bearing frame through the first bearing and the second bearing, the upper end of the first rotating shaft sequentially passes through the axis of the first bearing and the axial hole of the sample tray and is fixedly connected to the sample tray, and the lower end of the first rotating shaft sequentially passes through the axis of the second synchronous wheel and the axis of the second bearing and is installed, and is driven to rotate by the second synchronous wheel; The output shaft of the first motor rotates to drive the first synchronous wheel to rotate, and the second synchronous wheel is driven to rotate synchronously through the first synchronous belt. The second synchronous wheel drives the first rotating shaft to rotate, so as to drive the sample disk and the reaction disk to rotate.

6. The test liquid sample preparation mechanism for pesticide residue detection according to claim 2, characterized in that: The second drive assembly further includes a second motor, a third synchronous wheel, a fourth synchronous wheel, a second synchronous belt, a second bearing frame, a third bearing, a fourth bearing and a sleeve; The mechanical arm comprises a second rotating shaft and a cantilever, the upper end of the second rotating shaft is mounted with the liquid adding needle through the cantilever, the outer wall of the second rotating shaft is provided with a vertical slide groove along its axial direction, and the height of the vertical slide groove is the same as the lifting height of the liquid adding needle; The second motor is installed below the reagent tray; the third synchronous wheel is sleeved on the output shaft of the second motor; the fourth synchronous wheel is arranged side by side with the third synchronous wheel and is connected by the third synchronous belt transmission; the fourth synchronous wheel is provided with a fastening groove along its radial direction, and a steel ball and an elastic fastener are provided in the fastening groove; The third bearing is mounted on the second bearing frame and is located above the fourth synchronous wheel; the fourth bearing is mounted on the second bearing frame and is located below the fourth synchronous wheel; The second rotating shaft sleeve is provided with the shaft sleeve, the second rotating shaft and the shaft sleeve are installed on the second bearing frame through the third bearing and the fourth bearing, the upper end of the second rotating shaft and the shaft sleeve sequentially pass through the axis of the third bearing and the axial hole of the reagent disk and extend upward, the lower end of the second rotating shaft sequentially passes through the axis of the fourth synchronous wheel and the axis of the fourth bearing and is installed, and is driven to rotate by the fourth synchronous wheel; The shaft sleeve is provided with a radial through hole; the elastic fastener passes through the radial through hole to push the steel ball, and tightens the steel ball into the vertical slide groove of the second rotating shaft; The output shaft of the second motor rotates to drive the third synchronous wheel to rotate, and the fourth synchronous wheel is driven to rotate synchronously through the second synchronous belt. The fourth synchronous wheel drives the second rotating shaft, the shaft sleeve, the second rotating shaft, and the liquid filling needle to rotate.

7. The test liquid sample preparation mechanism for pesticide residue detection according to claim 6, characterized in that: The second driving assembly further includes a lifting unit, which includes a connecting block, a lifting motor, a sliding block and a guide rail; Therefore, the connection block is provided with a first connection hole and a second connection hole side by side; The lifting motor is installed above the connecting block, and the lead screw of the lifting motor extends downward and passes through the second connecting hole and is fixedly installed with the connecting block; The guide rail is installed in parallel with the lead screw of the lifting motor; one side of the slider is slidably installed in cooperation with the guide rail, and the other side is fixedly installed with the connecting block; The lower end of the second rotating shaft passes through the first connecting hole and is fixedly mounted to the connecting block through the first connecting hole; When the screw rod of the lifting motor moves up and down, it drives the slider to slide on the guide rail, and drives the connecting block, the second rotating shaft and the liquid adding needle to move up and down, and the vertical slide groove of the second rotating shaft and the steel ball generate relative movement.

8. The test liquid sample preparation mechanism for pesticide residue detection according to claim 1, characterized in that: The reagent disk is also provided with a needle washing position, which is adjacent to the reagent position and is used for installing a cleaning device.

9. The test liquid sample preparation mechanism for pesticide residue detection according to claim 1, characterized in that: The delivery device comprises a first valve, a buffer zone, a second valve and a plunger pump which are connected in sequence; the first valve is connected to the liquid adding needle through a pipeline; When extracting liquid samples, the plunger pump operates to provide suction, and the liquid samples are extracted into the buffer zone through the second valve, the first valve, and the liquid adding needle; When the liquid sample is injected, the plunger pump operates to provide thrust, and releases the liquid sample stored in the buffer zone through the second valve, the first valve, and the liquid adding needle.

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